Capas says Roberson and his female companion surrendered their handguns to the bartender when they entered the saloon Friday evening and that the struggle and shooting occurred after the couple retrieved their guns early Saturday morning.

It's not immediately known whether Roberson has an attorney who could comment on his behalf.

Tombstone was the site of the infamous 1881 gunfight at the O.K. Corral between lawmen and outlaws. It also was the home of Doc Holliday, a dentist who played a role In the shootout.